Hello.
Caught this panic this morning during `hammer cleanup' on a Atom D510
based system with 4G bytes of RAM installed and running x86_64 kernel.
It was running pbulk at the same time. The kernel was built from source
s of 8d2576868. The `insufficient buffers to rebalance the tree' warnings
have been observed before the system panicked. The global variable nbuf
(which holds the value for vfs.nbuf sysctl node) contains 1475 in the kgdb
session, which is much lower than the value seen on other systems running
32-bit kernel.